Redis：bigkeys内存分析

场景

        随着时间流逝，redis内存逐步增大，需要对redis内存进行清理，发现问题，解决问题。

方案

bigkeys 命令用于识别在 Redis 数据库中占用最多内存的键。

对服务有一定开销，在使用系统低峰期操作。

redis-cli -c -h 127.0.0.1 -p 7021 --bigkeys

输出结果

# Scanning the entire keyspace to find biggest keys as well as
# average sizes per key type.  You can use -i 0.1 to sleep 0.1 sec
# per 100 SCAN commands (not usually needed).

[00.00%] Biggest string found so far '"xxx22"' with 172 bytes
[00.45%] Biggest hash   found so far '"xx111"' with 1 fields
....
[06.72%] Biggest list   found so far '"lizzList"' with 1 items
...
[39.70%] Biggest set    found so far '"setlizz:20"' with 8 members
[50.22%] Biggest hash   found so far '"hashlizz:123123"' with 2480 fields
[85.93%] Biggest string found so far '"string111:12321312"' with 445240 bytes
[95.07%] Biggest zset   found so far '"lizzZset"' with 30 members

-------- summary -------

Sampled 32329 keys in the keyspace!
Total key length in bytes is 1496560 (avg len 46.29)

Biggest   list found '"lizzList"' has 1 items
Biggest   hash found '"hashlizz:123123"' has 2480 fields
Biggest string found '"string111:12321312"' has 445240 bytes
Biggest    set found '"setlizz:20"' has 8 members
Biggest   zset found '"lizzZset"' has 30 members

4 lists with 4 items (00.01% of keys, avg size 1.00)
329 hashs with 3956 fields (01.02% of keys, avg size 12.02)
31922 strings with 6028942 bytes (98.74% of keys, avg size 188.86)
0 streams with 0 entries (00.00% of keys, avg size 0.00)
16 sets with 27 members (00.05% of keys, avg size 1.69)
58 zsets with 237 members (00.18% of keys, avg size 4.09)

 结果说明

[95.07%] Biggest zset   found so far '"lizzZset"' with 30 members

1. 表示当前在内存使用最大的键，不包括值内容
2. 95.07% ：当前扫描进度
3. zset ：键值类型为，包括zset、list、set、hash、string
4. ‘”lizzZset”‘ ： 键名
5. n members：队列键值有n成员
6. n items：队列键值有n个成员
7. n bytes ：字符串键值占用n个字节
8. n fields ： 集合键有n个字段

Sampled 32329 keys in the keyspace!
Total key length in bytes is 1496560 (avg len 46.29)

• 对键空间采样，共检查了 32329 个键。
• 键的总长度为 1496560 字节，平均长度为 46.29 字节。

Biggest   list found '"lizzList"' has 1 items
Biggest   hash found '"hashlizz:123123"' has 2480 fields
Biggest string found '"string111:12321312"' has 445240 bytes
Biggest    set found '"setlizz:20"' has 8 members
Biggest   zset found '"lizzZset"' has 30 members

• 每个数据类型的最大占用健 

31922 strings with 6028942 bytes (98.74% of keys, avg size 188.86)

• 31922 个String类型的健，总的内存空间为6028942个字节，健数量的占比为98.74%，健值大小平均为188.86bytes。
• 其他类型。

代码007普通

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